[MrBrechreiz]

Gleiche mal dein head Template mit dem folgenden ab.

Code:

<a name="top" id="top"></a>
<br /><br />
<div id="panel">{$welcomeblock}</div>
<br /><br />

<div class="header_right">
<div class="menu">
<ul>
<li><a href="{$mybb->settings['bburl']}/portal.php" class="portal"><img src="{$mybb->settings['bburl']}/{$theme['imgdir']}/icons/home.png" alt="" title="" />{$lang->toplinks_portal}</a></li>
<li><a href="{$mybb->settings['bburl']}/index.php" class="index"><img src="{$mybb->settings['bburl']}/{$theme['imgdir']}/icons/forums.png" alt="" title="" />Forums</a></li>
<li><a href="{$mybb->settings['bburl']}/search.php" class="search"><img src="{$mybb->settings['bburl']}/{$theme['imgdir']}/icons/search.png" alt="" title="" />{$lang->toplinks_search}</a></li>
<li><a href="{$mybb->settings['bburl']}/memberlist.php" class="members"><img src="{$mybb->settings['bburl']}/{$theme['imgdir']}/icons/memberlist.png" alt="" title="" />Members</a></li>
<li><a href="{$mybb->settings['bburl']}/calendar.php" class="calendar"><img src="{$mybb->settings['bburl']}/{$theme['imgdir']}/icons/calendar.png" alt="" title="" />{$lang->toplinks_calendar}</a></li>
<li><a href="{$mybb->settings['bburl']}/misc.php?action=help" class="help"><img src="{$mybb->settings['bburl']}/{$theme['imgdir']}/icons/help.png" alt="" title="" />{$lang->toplinks_help}</a></li>
</ul>
</div>
</div>
</div>

<div class="header">
<div class="header_in">
<div class="logo"><a href="{$mybb->settings['bburl']}/index.php"><img src="{$theme['logo']}" alt="{$mybb->settings['bbname']}" title="{$mybb->settings['bbname']}" /></a></div>
            
</div>
</div>
</div>

<br /><br />

<div id="container">
<div id="content">
<navigation>

<hr class="hidden" />
<br class="clear" />
{$bannedwarning}
{$bbclosedwarning}
{$unreadreports}
{$pending_joinrequests}
{$pm_notice}
<br />

Die Sidebar kannst Du auch heraus löschen, hatte ich zu testzwecken eingebaut. (Ab Zeile 44 abwärts)

Wenn danach nochimmer Fehler auftreten, gleiche die relevanten Templates einfach aus deiner 1.6.10 Version ab.

Ansonsten wäre auch noch eine grössere Bildschirmgrösse ratsam